Methodological Evaluation of Water Treatment Facilities in Nigeria: A Randomized Field Trial for Yield Improvement Research

Water treatment facilities in Nigeria often struggle with yield inefficiencies, leading to insufficient water supply for communities. A randomized field trial was conducted across five regions in Nigeria, focusing on two types of water treatment facilities: sand filtration and activated carbon adsorption. Data collection included pre- and post-treatment water quality parameters and system operation logs. In the sand filtration systems, a significant increase (p < 0.05) was observed in treated water yield from 60% to 78%, while in activated carbon adsorption systems, the yield improved by 24% (CI: 19-30). The randomized field trial methodology showed promising results for improving water treatment facility yields. Further trials should be conducted with a larger sample size and across more regions to validate these findings. Water Treatment, Yield Improvement, Sand Filtration, Activated Carbon Adsorption, Randomized Field Trial The maintenance outcome was modelled as $Y_{it}=\beta_0+\beta_1X_{it}+u_i+\varepsilon_{it}$, with robustness checked using heteroskedasticity-consistent errors.